'World Water Day'

AFP/Getty Images

A woman collects drinking water in plastic pots from a community tap outside her residence in Bangalore, in wake of the annual 'World Water Day' observed on March 22. India's six biggest cities -- Mumbai, Delhi, Kolkata, Bangalore, Chennai and Hyderabad -- are among those most affected by water shortages.

A woman collects drinking water in plastic pots from a community tap outside her residence in Bangalore, in wake of the annual 'World Water Day' observed on March 22. India's six biggest cities -- Mumbai, Delhi, Kolkata, Bangalore, Chennai and Hyderabad -- are among those most affected by water shortages. (AFP/Getty Images)

A woman collects drinking water in plastic pots from a community tap outside her residence in Bangalore, in wake of the annual 'World Water Day' observed on March 22. India's six biggest cities -- Mumbai, Delhi, Kolkata, Bangalore, Chennai and Hyderabad -- are among those most affected by water shortages.